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4. Remove the pre-filter from the pre-filter grid and place it inside the poly bag. Wipe any residue
off of the pre-filter grid and base of the workstation. Place the rag inside the bag with the pre-
filter and seal the bag.
5. With a small wrench, remove the ¼ - 20 hex nuts and remove the filter hold down.
6. Place the spent HEPA filter into the second poly bag. Wipe any residue off of the filter hold
down frame and any other obvious areas. Place the second rag into the bag and seal the bag.
Dispose of both bags in accordance with your local guidelines for the substances that have
been used inside the hood.
Figure 11. AC740C Pre-filter and HEPA filter.
